Looking for a gang-related movie

It's from the 1970s I think. Lots of black people and it settles on 2 rival gangs and one traitor who is found out at the end of the movie. The movie's final scene takes place on a beach. It cuts to a gang leader closing in on the traitor at the end of the movie. I can't remember any more of it.

TIA

Warriors?

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“The gladdest moment in human life, methinks, is a departure into unknown lands.” – Sir Richard Burton

I think you're right 7thson, it sounds exactly like The Warriors.

It's got to be The Warriors. I'll be stunned if it isn't.

This is the scene on the beach

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5-time MoFo Award winner.

Warriors is right. Much thanks!